Almost all the new ones inclusing 3rd gen block chains don't, e.g. IOTA, Nano. They use PoS or a PoS/PoW hybrid, thus leading to 1/1000th of the energy consumpt

Almost all the new ones inclusing 3rd gen block chains don't, e.g. IOTA, Nano. They use PoS or a PoS/PoW hybrid, thus leading to 1/1000th of the energy consumption or 1/1,000,000.